Abstract
A joint TUNL-LLNL-LANL collaboration was formed to measure the absolute fission product yields from the 235 U, 238 U, and 239 Pu isotopes. Our goal is to study the energy evolution of fission products using monoenergetic beams. In order to extend our successful fission product-yield studies to include products with shorter half-lives, a RApid Belt-driven Irradiated Target Transfer System, named RABITTS, was constructed. This system allows us to perform cyclic activation and quantify fission products with γ-ray spectroscopy using HPGe detectors. Both a 1 meter and 10 meter transfer system have been developed, with transit times of 0.4 and 1.1 seconds, respectively. Using these systems, we have measured sub-second half-lives. Our goal is to measure fission product yields from neutron-induced fission with En = 0.5 − 14.8 MeV and photofission with Eγ = 8 − 15 MeV. A detailed characterization of the system’s performance is presented, including preliminary fission product measurements, and the expected sensitivity.
Highlights
IntroductionThe dominant nuclear fission process produces two fission fragments, which promptly evaporate neutrons and result in two fission products
Fission product yields (FPYs) are a principal observable of the fission process
Data has been taken on 235,238U, 239Pu for neutron-induced fission at En = 2.0, 4.5 MeV, and photofission at Eγ = 11.2, 13.0 MeV
Summary
The dominant nuclear fission process produces two fission fragments, which promptly evaporate neutrons and result in two fission products. These fission products are created far from nuclear stability, and usually undergo multiple decays before reaching stability. Great detail is taken to perform these experiments in such a way as to minimize systematic uncertainties between the different measurements These results are an extensive self-consistent nuclear data set of FPYs. The goal of the present work is to extend these cumulative FPY measurements towards independent FPY measurements. The goal of the present work is to extend these cumulative FPY measurements towards independent FPY measurements This involves measuring fission products with progressively shorter half-lives.
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